Author Topic: PV SPD location  (Read 76 times)

jnahanna@gmail.com

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PV SPD location
« on: December 14, 2017, 11:32:02 AM »
So I have a question.  What is the best place for the PV SPD?  My PV panel rack is 400 ft from the Charge controllers and the wiring is 4/0 AL buried.  I do have combiner boxes under the PV array but we aren't supposed to use the knockouts on the side for outdoor installs.  Should I mount them at the array or close to the CC.

The AC ones are on the breaker box near the inverter and CC's.

Thanks, Jim

ClassicCrazy

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Re: PV SPD location
« Reply #1 on: December 14, 2017, 01:07:23 PM »
Curious why you can't use the side knockouts at the combiner ? Is that a code or inspector rule ?  The SPD does have a gasket . I mounted mine on outside combiner box on the side .  As for the best location I am not sure about that if one is better than the other .

Larry
system one
Classic 150 , 5s4p  Kyocera 135watt , 12s Soneil 2v 540amp lead crystal for 24v pack , Outback 3524 inverter
system two
Classic 150 ,5s 135 watt Kyocero , 16s Calb 100AH LiFePO4 , Outback VFX 3648 inverter
system three
Midnite KID MPPT 24 DC in to  12 volt AGM batterie

keithwhare

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Re: PV SPD location
« Reply #2 on: December 15, 2017, 01:29:48 PM »
With 400 ft of cable between the combiner and the charge controllers, I would use an SPD at both ends.

Keith

CDN-VT

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Re: PV SPD location
« Reply #3 on: December 16, 2017, 12:55:02 AM »
I agree with Both .

Use a side knock out , seal with the SPD flat seal nut out & the internal nut lock , use the rubber washer outside the box .
Done .

I will put tape on the SPD to lower the LED light output .
Another inside is Backup !!

VT

Edit add :
The tape is to tone down the brightness at night . Between external MNBMS greens etc , it can look like Dec year round. So I have painted the green leds 1/2 to tone them down .
I live in a forest away from lights , black is the night shade.

VT
« Last Edit: December 16, 2017, 04:32:05 PM by CDN-VT »
Canadian Solar 350W 37.6 VOC  30.6 VMP 8.22 ISC 7.87 IMP ,-15 c +30c max  4 strings in 2 in Series for 24v Classic 150 -1020 Ah  Freezers & fridges ~~~ Second Array same panels of 3sx3 parallel for 24 V Classic 150 -440 Ah Outback Barns & out blds.
48Vdc almost done.